FIELD: medicine.;SUBSTANCE: method ensures that the head end of the table is lowered and the Trendelenburg position is given to the patient when an internal jugular vein is shown on the screen of an ultrasound scanner on the screen, a reassessment of the respiratory excursion of the vein takes place 1 minute after the next lowering of the head end of the table, and providing the conclusions about the patient's readiness for catheterization of the vein with the disappearance of the respiratory excursion of the vein on the screen of the ultrasound scanner.;EFFECT: method reduces the risk of complications by excluding the patient's excessively large angle of inclination in the Trendelenburg position and eliminating the sagging of the vein.;1 cl
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